Alexandee ceawfobd chenoweth



(No Model.) 7

' A. C. CHENOWETH.

LAYING CONTINUOUS ELECTRIGAL GONDUITS.

No. 366,457. Patented July 12,1887.

INVENTOR .7/4i7mw% BY Jail/WM ATTORNEYS.

WITNESSES N FETERS. Phow-Lnm n UNITED STATES ATENT OFFICE.

ALEXANDER ORAWFORD OHENOWETH, OF NEYV YORK, N. Y.

LAYING CONTINUOUS ELECTRICAL CONDUITS.

SPECIFICATION forming part of Letters Patent No. 366,457, dated July 12,1887.

Application filed November 16, 1886. Serial No. 219,107.

To all whom it may concern:

Beit known that I, ALEXANDER CRAWFORD CHENOWETH, a citizen of the UnitedStates, residing in New York city, county and State of New York, haveinvented certain new and useful Improvements in Laying ContinuousConduits for Electrical \Vires or other Purposes, of which the following.is a specification.

My invention consists of a method of laying and forming conduits, ashereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a plan view showing a portion of a trench, conduit-core, andremovable casing for the core. Fig. 2 is a plan view of the same withoutthe trench, and Fig. 3 is a transverse section showing a circularconduit. Figs. at and 5 show the forms of conduit-molds.

In forming the conduit I use a core, A, )referably of wood, preferablyround in cross-section, and of any suitable length. This core I inclosein a casing, B, preferably of rope or wire wrapped spirally around thecore,so that it may be withdrawn easily from the casing.

The conduit 0, preferably of asphaltnm or other concrete, is builtaround the casing and left a sufficient length of time .to set. Then thecore A is withdrawn from the casing B, and,finally, the casingiswithdrawmwhieh can be easily done by grasping the outer end of the coiland drawing outward upon it, thus leaving the conduit complete, withauunobstructed passage through it for the insertion of electric wiresand cables. In this manner sections of conduit may be formed, to besubsequently laid in the ground, end to end, to form a continuoussubwayconduit; but I prefer to form or mold the conduit in the ground,in which case I dig a trench, D, in the ground and incase it with acasing, E, of wood or other material, or form only a bottom, E, ofcement, asphaltum, wood, or other suitable material, in the trench. Thecore A and casing B are then suspended in the trench by a suitableframe, F, provided with a bail, f, which holds the core and easing ashort dis- (No model.)

tance above the bottom ofthe trench. I then pour the plastic material toform the conduit about the core and casing and tamp it well under andall around the casing. After the conduit material is set sufficiently Iwithdraw the core and subsequently the casing,and then proceed as beforeto form another section, joining it on the end of the last section, thusforming a continuous conduit.

In order to facilitate the withdrawal of the casing B after it is placedupon the core, I smear it upon the outside with a thin layer, h, ofplaster or other material, so that the plastic material composing theconduit will not settle into or between the coils. If wire is used forthe casing, this need not be done.

In building the conduit around the core and easing it is foundconvenient, to expedite the work, to use a mold-box, H, U shaped orthreesided, as shown in Figs. 4 and 5, in which the core and easing areplaced, so that the conduit material may be poured into the model-boxand tamped around the casing.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The method herein described of forming electric conduits of plasticmaterial, which coir sists in building the conduit material around acore, and a casing placed upon and surrounding the corc, and thenwithdrawing the core from the casing, and subsequently with drawing thecasing, substantially as set forth.

2. The method herein described of forming subway-conduits, whichconsists in wrapping a core spirally with aeasing,suspendin g thesame inthe trench,pouring and forming the conduit material around the casing,then withdrawing the corc, and finally the casing, substantially asdescribed.

3. The method herein described of forming electric conduits, whichconsists in wrapping a core spirally with a casing, covering the easing,then building the conduit material about the casing, and thenwithdrawing the core and then casing, substantially as described.

ALEXANDER CRAWFORD OIIENOWE'IH.

Vitnesses:

HENRY N. IIAMILTON, EDWARD F. PLAYLE.

